diff --git a/notes/sections/7.md b/notes/sections/7.md
index b4d8004..27ee1bd 100644
--- a/notes/sections/7.md
+++ b/notes/sections/7.md
@@ -183,7 +183,7 @@ probability $P(c_k | t_{\text{cut}})$ being the same for both classes $c_k$:
 $$
   t_{\text{cut}} = x \, | \hspace{20pt}
  \frac{P(c_1 | x)}{P(c_2 | x)} = 
- \frac{P(x | c_1) \, P(c_1)}{P(x | c_1) \, P(c_2)} = 1
+ \frac{P(x | c_1) \, P(c_1)}{P(x | c_2) \, P(c_2)} = 1
 $$
 
 where $P(x | c_k)$ is the probability for point $x$ along the Fisher projection